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PONTIAC, Mich. — A 75-year-old woman was convicted Tuesday of second-degree murder for killing her teenage grandson last spring in her Detroit-area home, after jurors rejected her claim that she shot him six times in self-defense.

Sandra Layne cried quietly when she heard the verdict, which was delivered during the first full day of jury deliberations. She was also found guilty of using a firearm during a felony and likely faces at least 14 years in prison for the death of her grandson, Jonathan Hoffman.